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| Publication Type:
| Refereed |
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| Author(s): | Thelen, Kurt D.;
Jackson, Evelyn P.;
Penner, Donald |
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| Author Affiliation: | Program Manager, Michigan Department of Agriculture, Lansing MI; Specialist, Department of Chemistry, Max T. Rogers NMR Facility; Professor, Department of Crop and Soil Science, Michigan State University, East Lansing, MI. |
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| Title: | Characterizing the sethoxydim-bentazon interaction with proton nuclear magnetic resonance spectrometry |
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| Source: | Weed Science. Vol. 43, No. 3, July-September 1995, p. 337-341. |
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| Publishing Information: | Champaign, IL: Weed Science Society of America |
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| # of Pages: | 5 |
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| Keywords: | TIC Keywords: Herbicide interaction; Absorption; Sethoxydim; Bentazon; Antagonism
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| Abstract/Contents: | "The antagonistic effect of Na-bentazon on sethoxydim absorption and herbicidal activity has been documented. The addition of ammonium sulfate (AMS) with a surfactant overcomes the observed loss of sethoxydim activity. Nuclear Magnetic Resonance(NMR) was used to study the chemical effects of commercially formulated Na-bentazon, NaCl, NaHCO³, Na-bentazon plus AMS, and NaHCO³ plus AMS on commercially formulated sethoxydim. Technical grade Lisethoxydim and sethoxydim were analyzed and ₁H-NMR spectra were used as comparative standards. Data indicate an association of Na₊ from Na-bentazon, NaHCO³ and NaCl with the sethoxydim molecule. NH⁴₊ from AMS appears to associate spatially with sethoxydim but does not exert the same electronic effect on the sethoxydim ring protons as observed with Na₊ or Li₊. The addition of AMS to sethoxydim plus Na-bentazon or NaHCO³ treatments prevents the complexation of Na₊ with the sethoxydim molecule. The data support the hypothesis that the observed Na-bentazon antagonism and ammonium sulfate reversal of antagonism are chemically based." |
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| Language: | English |
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| References: | 12 |
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| Note: | Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Thelen, K. D., E. P. Jackson, and D. Penner. 1995. Characterizing the sethoxydim-bentazon interaction with proton nuclear magnetic resonance spectrometry. Weed Sci. 43(3):p. 337-341. |
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